Pulley and the like



March 18 1924.

L. R. TUTEN PULLEY AND THE LIKE Filed March 24, 1925 Patented Mar. 18, 1924.

PATENT OFFICE.

LAURENCE B. TUTEN, OF COLUMBIA, SOUTH CAROLINA.

runner AND rim 1.11m

Application filed March 24, 1923. Serial No. 627,842.

To all whom it may concern:

Be it known that I, LAURENCE R. TU'I'EN, a citizen of theUnited States, residing at Columbia in the county of Richland and State of outh Carolina, have invented certain new and useful Improvementsin Pulleys and the like, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates to improvements in pulleys and the like, and more particularly to a means for attaching the same to the drive or driven shaft.

An important object of the invention is to provide means for this purpose which is completely concealed within the. pulls and which accordingly cannot become accidentally disengaged from the pulley and lost therefrom.

A further object of the invention is to provide a device of this character which by the operation of the pulley applies an increased hold upon the operating or operated shaft, proportional to the strain to which the pulley is subjected.

A still further object of the invention is to provide a device of this character which is readily adjustable and by means of which a pulley is so constructed that it may be readily bushed for use with the shafts of difi'erent sizes, it being well known that bushed pulleys are extremely diflicult in the ordinary construction to maintain in position upon end shafts.

These and other objects I attain by the construction and arrangement shown in the accompanying drawings, wherein for the purpose of illustration is shown a preferred embodiment of my invention and wherein like reference characters designate like parts.

Inthe drawings Figure 1 is a vertical sectional view taken through a pulley constructed in,aocordance with my invention;

Figure 2 is an end elevation of the hub showing the parts broken away to disclose the locking key, the arrow A indicating the direction of rotation if power be applied to the pulley and B the direction of rotation if power be applied to the shaft;

Figure 3 is a view similar to that shown in Figure 2, the pulley being shown bushed.

Referrin now more particularly to the drawings, t e numeral 10 indicates the'hub of a pulley or the like and 11 the bore of the hub, adapted to the reception of the shaft 12. In accordance with my invention I provide in the wall of the hub bore 11, a recess" 13 extending longitudinall of the hub, and h'avin its ends spaced fi om the adjacent ends t ereof so that a wall 14 is provided intermediate each end of the recess and the adjacent end wall of the hub. Each of the walls 14 has threaded therein and extending therethrough into the recess, a set screw 15, shown in the present instance as a socket head set screw, for the reason that by the use of such set screws projection of the end of the screw or the end of the hub is avoided.

The recess 13 tapers in depth from end to end so that its bottom wall 16 inclines upwardly toward one end of the hub. This bottom wall is likewise inclined transversely from side to side, being preferably slight y curved, as more clearly shown in Figure 2. A key 17 is provided, conforming to the shape of the recess 13 when the hub is applied to the shaft, the shaft engaging face of the key 17 being provided with longitudinally extending teeth 18. The key 17 is of less length than the recess 13 and likewise of less breadth than such recess and is preferably of such thickness, that with its large end positioned so that it is slightly spaced from the end wall of the large end of the recess 13 and with its wide side face adjacent the wide side of the recess, the hub may be readily applied to the shaft. When the pulley is properly positioned upon the shaft the key may be tightened by tightening the set screw 15, abuttin the large end of the key. The key is shi ed longitudinally of the groove and its teeth bite into the surface of the shaft, the key during the tightening movement acting as a wedge. To prevent scraping or cutting of the shaft during endwise movement of the key and likewise to prevent similar effects upon the bottom wall 16 of the recess, the 'uncture of the end walls of the ke 17 wit the top and bottom faces thiereo is preferably in the form of a curved e go.

In placing the pulley upon the shaft care must be taken to apply the same to the shaft in such a manner that when the pulley is in operation the tendency of the pulley will be to move upon the shaft in a direction with the wide side of the recess 13 in advance. If the pulley be driven by a belt from an inspection of Figure 3 thereof. In

the wide'side 13 of the recess must be faced n the direction of movement of the pulley. If the pulley, however, be driven by the shaft upon which it is mounted, the wide side 13 of the pulley must be so placed that it is in the rear during rotation of the pulley under the influence of the shaft. When the pulley is so applied and the drive a plied thereto, the inertia of the pulley and of the load applied to the ulley tends to cause a relative rotation of the shaft 12 and the hub 10 of the pulley, with a result that the hub will shift with relation to the shaft in such a direction that the key 17 is moved toward the narrow side of the recess 13 and acts further to wedge the pulley andshaft into firm engagement.

The particular advantages of this construction will become obvious from an inspection of the drawings and particularly this figure I have shown a pulley having the securing means constructed in accordance 'with my invention, hushed to receive a smaller shaft than that for which it was originally intended. In order to accomplish this purpose all that is necessary is to provide a bushing 19, preferably a split bushing of the desired size and to form therein an opening 20, corresponding to the opening in the wall of the bore 11 of the hub, defined by the recess 13, and to provide a thicker key 17 than is provided when the pulley is employed unbushed. If desired, a plurality of these bushings can be employed in the same hub but since this is an obvious variation in the construction I have not herein illustrated the same.

- From the foregoing it will be obvious that a pulley constructed in accordance with my invention may be readily applied to the shaft and will be very firmly aiiixed thereto when so applied. When it is desired to remove the pulley all that is necessary for such removal is to back off the set screw 15 abutting the large end of the keyand to tighten the set screw abutting the smaller end thereof, when the key will be shifted to the large end of the recess and released to permit movement of the pulley upon the shaft. The key will further be held in such released position that it will not interfere with sliding of the pulley to a point where it may be removed or to a desired adjusted position. It will further be obvious that the construction herein set forth is capable of some change in modification without materially departing from the spirit of my invention and I accordingly do not limit myself to such specific structure except as hereinafter claimed.

I claim 1. The combination with a pulley having a recess formed in the wall of the shaft receiving bore thereof, the recess tapering from end to end, of a similarly tapered key mounted in said recess, and means extending through the ends of the hub into said recess and engaging a ainst the ends of said key for shifting the my longitudinally of the recess, said recess being transversely tapered, said key being similarly tapered.

2. The combination with a pulley having a recess formed in the wall of the shaft receiving bore thereof, the recess tapering from end to end, of a similarly tapered ke mounted in said recess, and means exten ing through the ends of the hub into said recess and engaging a ainst the ends of said key for shifting the ey longitudinally of the recess, a bushing disposed within the bore of a hub and having an opening formed in the wall thereof corresponding to the opening defined by the recess of such wall of the hub bore, said key extending through the opening of the bushing for engagement with a shaft.

In testimony whereof I hereunto afiix my signature.

LAURENCE R. TUTEN. 

